\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 4/0/C, 2.8/2.8/A}
    \tkzDefPointOnLine[pos=0.4](A,B)  \tkzGetPoint{E}
    \tkzDefPointOnLine[pos=0.4](A,C)  \tkzGetPoint{F}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegment(E,F)
    \tkzMarkAngle[size=0.75](F,E,A)
    \tkzLabelAngle[pos=0.5](F,E,A){$1$}
    \tkzMarkAngle[size=0.65](A,F,E)
    \tkzLabelAngle[pos=0.4](A,F,E){$2$}
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](B,E)
    \tkzLabelPoints[right](C,F)
\end{tikzpicture}

